- Take into account energy loss in the target for reconstruction
     of the excitation energy
   - change makefile to recompile when header files are changed

* Clean some part of the code to remove warnings at compilation time

   - Limitation: only works for beams parallels to the optical axis
     (no beam divergence)
   - Only implemented for the moment in EventGeneratorTransfer.cc

* Changes in the INSTALL files to insist on having a working GSL install
  and a ROOT MathMore module

   - This is useful for elastic scattering studies

* Add CH2 material for target definition

* Change ushort for unsigned short in *.cc files

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* Rename Gaspard geometry input files

* Add one differential cross section file

* New version of Gaspard analysis code

* Fill all fields of the TInitialCondition class for an isotropic event
  generator

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   - First Root file was not treated
   - Last Root file was treated twice

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   - modify the TInitialConditions class to record theta and phi angles
   - store theta and phi in the output tree in EventGeneratorTransfert.cc

* Add information header to the previous files

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   - Add TGaspardTrackerPhysics.{h,cxx} and GaspardTracker.{h,cxx} in NPLib
   - Correct a bug concerning the name of the InitializeScorers() method

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